L41: Arado's WW2 Experimental MP40 Silencer

Published on February 19, 2024
Duration: 8:19

This guide details the installation of the experimental Arado L41 suppressor on an MP40 submachine gun, as explained by Ian McCollum. It covers the specialized mounting cap, internal left-hand threads, and the importance of securing the unit to prevent muzzle strikes, especially given the MP40's original barrel threading for blank adapters.

Quick Summary

The Arado L41 suppressor for the MP40 featured rubber baffles and a unique mounting system that clamped onto the front sight block. Its exit diameter was increased to 11mm to prevent bullet strikes, a common issue due to the MP40's barrel threads originally being designed for blank adapters, not precise suppressor alignment.

Chapters

  1. 00:00Introduction to MP40 Suppressors
  2. 01:04Technical Challenges and Threading Issues
  3. 03:16L41 Arado Suppressor Design
  4. 05:03Mounting Mechanism
  5. 06:45Historical Context and Subsonic Ammunition

Frequently Asked Questions

What was the main design difference between the Arado L41 and Schneider-Opel MP40 suppressors?

The Arado L41 suppressor utilized rubber baffles, similar to Russian Bramit designs, for the MP40. In contrast, the Schneider-Opel design employed traditional metal baffles and was considerably longer, representing different approaches to sound suppression for the submachine gun.

Why did the MP40's suppressor exit diameter need to be increased?

The MP40's barrel threads were originally intended for blank firing adapters, meaning thread concentricity wasn't a priority. This could cause bullets to strike the suppressor, so the exit diameter was enlarged to approximately 11mm to prevent strikes, though it reduced effectiveness.

How did the Arado L41 suppressor attach to the MP40?

The L41 suppressor featured a specialized mounting cap with wings that locked onto the MP40's front sight block. This, combined with a tensioning clamp and locking screw, ensured the unit remained indexed and secure during firing.

What type of ammunition was developed for German suppressors in WW2?

Germany developed 9mm subsonic ammunition for suppressors by increasing bullet weight to 9 grams (139 grains) from the standard 8 grams (124 grains). This modification achieved a lower muzzle velocity of around 1080 fps, suitable for suppressed fire.

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